I was setting up a quick Document-based app, but all of the ReferenceFileDocument APIs appear to be synchronous only. Is there a path to using that with async API? In particular, I'd hoped to call "await" in the closure from a Document snapshot/save to push the data elsewhere. Am I missing something obvious there?

I just watched the video on building better Document-based apps, and I'm curious to know if the "Document-picker presentation" feature is available on SwiftUI and how to accomplish it... I've tried changing the Info.plist as in the video but I'm not sure I'm doing it right.